Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

Please help me solve the following problem: Problem 7 (25 points) J Light is incident on the surface of metallic sodium, from which 2.4 ev

Please help me solve the following problem:

image text in transcribedimage text in transcribed
Problem 7 (25 points) J Light is incident on the surface of metallic sodium, from which 2.4 ev are required to remove an electron. The stopping potential is 6.4 volts. (Note that 1 ev = 1.6 x 10-19 J.) (a) Find the wavelength of the incident light. (8 points) (b) Would this light emit any electrons from a metal whose work function is 7.3 ev? If so, determine the maximum kinetic energy of an emitted electron (in either J or eV). If not, explain why. (8 points) (c) If the power of the light source is 5.0 mW, how many photons are emitted by the source in 20 seconds, and what is the momentum of each photon? (9 points)Problem 8 (20 points) The radioisotope , Sr has a half-life of 29 years. One sample has an initial activity of 8.90 x 105 Bq. (Note that the mass of one proton or neutron is approximately 1.67 x 10-27 kg.) (a) What is the initial mass of the sample? (10 points) (b ) How many nuclei in this sample decay in the time interval between / = 3.0 years and / = 5.0 years? (10 points) 6.024 inyens

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

University Physics Volume 1

Authors: William Moebs, Samuel J. Ling, Jeff Sanny

1st Edition

168092043X, 9781680920437

More Books

Students also viewed these Physics questions